imagecolorresolvealpha

(PHP 4 >= 4.0.6, PHP 5, PHP 7, PHP 8)

imagecolorresolvealpha — Get the index of the specified color + alpha or its closest possible alternative

Descrizione

imagecolorresolvealpha(
    GdImage $image,
    int $red,
    int $green,
    int $blue,
    int $alpha
): int

This function is guaranteed to return a color index for a requested color, either the exact color or the closest possible alternative.

Elenco dei parametri

image: Una risorsa immagine, restituita da una delle funzioni di creazione immagine, come imagecreatetruecolor().
red: Valore della componente rossa.
green: Valore della componente verde.
blue: Valore della componente blu.
alpha: A value between 0 and 127. 0 indicates completely opaque while 127 indicates completely transparent.

The colors parameters are integers between 0 and 255 or hexadecimals between 0x00 and 0xFF.

Valori restituiti

Returns a color index.

Log delle modifiche

Versione	Descrizione
8.0.0	`image` expects a GdImage instance now; previously, a valid `gd` resource was expected.

Esempi

Example #1 Using imagecoloresolvealpha() to get colors from an image

<?php
// Load an image
$im = imagecreatefromgif('phplogo.gif');

// Get closest colors from the image
$colors = array();
$colors[] = imagecolorresolvealpha($im, 255, 255, 255, 0);
$colors[] = imagecolorresolvealpha($im, 0, 0, 200, 127);

// Output
print_r($colors);

imagedestroy($im);
?>

Il precedente esempio visualizzerà qualcosa simile a:

Array
(
    [0] => 89
    [1] => 85
)

Vedere anche:

imagecolorclosestalpha() - Get the index of the closest color to the specified color + alpha

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